• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.35.2-35.2
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• 2008

The Albedo MONitor and RAdiometer (AMON-RA) instrument system is designed to measure Earth global albedo anomaly over the wavelength range of 0.3um to 4um. The instrument consists of two interconnecting optical subsystems i.e. a visible channel and an energy channel. The energy channel instrument consists of a modified Winston cone, a couple of relay mirrors and a pyro-electric detector. First, we report the integration and alignment process, leading to the prototype bolometer instrument. We then discuss the radiometric performance characterization including laboratory measurement results and the future plan for further incorporation of the bolometer instrument into the prototype AMON-RA instrument.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.12
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• pp.87-95
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• 2009

In this paper, an area-efficient FFT processor is proposed for MIMO-OFDM based SDR systems. The proposed scalable FFT processor can support the variable length of 64, 128, 512, 1024 and 2048. By reducing the required number of non-trivial multipliers with mixed-radix (MR) and multi-path delay commutator (MDC) architecture, the complexity of the proposed FFT processor is dramatically decreased without sacrificing system throughput The proposed FFT processor was designed in hardware description language (HDL) and synthesized to gate4eve1 circuits using 0.18um CMOS standard cell library. With the proposed architecture, the gate count for the processor is 46K and the size of memory is 64Kbits, which are reduced by 59% and 39%, respectively, compared with those of the 4-channel radix-2 single-path delay feedback (R2SDF) FFT processor. Also, compared with 4-channel radix-2 MDC (R2MDC) FFT processor, it is confirmed that the gate count and memory size are reduced by 16.4% and 26.8, respectively.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.7
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• pp.39-46
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• 2009

A fast-switching current-pulse driver for light emitting diode (LED) backlight is proposed. It uses a regulated drain current mirror (RD-CM) [1] and a high-voltage NMOS transistor (HV-NMOS). It achieves the fast-response current-pulse switching by using a dynamic gain-boosting amplifier (DGB-AMP). The DGB-AMP does not discharge the large HV-NMOS gate capacitance of the RD-CM when the output current switch turns off. Therefore, it does not need to charge the HV-NMOS gate capacitance when the switch turns on. The proposed current-pulse driver achieves the fast current switching by removing the repetitive gate discharging and charging. Simulation results were verified with measurements performed on a fabricated chip using a 5V/40V 0.5um BCD process. It reduces the switching delay to 360ns from 700ns of the conventional current-pulse driver.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.05a
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• pp.9-9
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• 2009

Coated conductor is required to have good critical current property for high efficiency of electric power applications. Until now, long coated conductor does not show high Jc over 3 MA/$cm^2$ in thick superconducting layer because of texture degradation by thick superconducting layer. In this study, in order to overcome this issue, thicker superconducting layer was deposited with optimized conditions to reduce the degradation of critical current density. SmBCO superconducting coated conductor was deposited with 1~3 um of thickness at $750\sim850^{\circ}C$ under 15~20 mTorr of oxygen partial pressure using batch type EDDC( evaporation using drum in dual chamber). The buffered substrate for superconducting layer deposition was used IBAD-MgO template with the architecture of $LaMnO_3/MgO/Y_2O_3/Al_2O_3$/Hastelloy. After fabrication of coated conductor, critical current was measured by 4-prove method under self-magnetic field and 77K. In addition, surface morphology and texture were analyzed by SEM and XRD, respectively. 3 um thick SmBCO coated conductor shows highest $I_C$ values of 638A/cm-w in 1 m long in the world.

• Journal of the Korean Magnetics Society
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• v.15 no.2
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• pp.148-152
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• 2005

A novel interferometric isolator has been proposed and designed to fabrticate waveguide magnetooptic isolator operating at a wavelength of $1.55{\cal}um$. The device consists of MMI (multimode interference) couplers and has a magnetooptic guiding layer with different layer structure in arms of the inteferometer. The layer structures in the arms of inteferometer are $HfO_2/CeY_2Fe_5O_{12}/NOG$ and $SiO_2/CeY_2Fe_5O_{12}/NOG$, respectively. This configuration give rise to different nonreciprocal phase shift. In consequence, the isolator operates under a unidirectional magnetic field. The optimized structure of the isolator was determined by a 3D beam propagation method.

• Journal of the Korean Society for Railway
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• v.12 no.4
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• pp.597-603
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• 2009

In this study, Based on the optimization developed in Um et al. (2009), optimum design method of the alignment when building new lines and renewing existing ones is presented. The object function used for optimization is passenger comfort ($P_{CT}$) which was proposed in BSI (2006). Other aspects of track/vehicle interaction will be treated in boundary conditions. And track/vehicle interaction analysis is peformed using KTX-II model. From the analysis results, it was found that the optimum alignments are affected by the angle (I) between adjacent straight lines and $R-L_t$ combinations. Also the dynamic analysis confirms well the results from the simplified analysis. However, In the most cases, the $P_{CT}$ values in the dynamic analysis are higher than the simplified $P_{CT}$ values. If both methods are used when optimizing the alignment, it will be possible to design the alignments more rapidly and reliably.

• The Journal of Korean Medicine
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• v.28 no.1 s.69
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• pp.51-62
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• 2007

Objectives . The types of Sasang constitutional medicine (SCM) have definite effect on response to herbal drugs. The majority of human P45O dependent xenobiotic metabolism is carried out by polymorphic enzymes which can cause abolished, altered or enhanced metabolism. Therefore, we evaluated the relation of major CYP2C19, 2D6 polymorphism with Sasang types. Methods : 214 healthy subjects were recruited with informed consent; 172 among them had Sasang diagnosis by QSCC2. CYP2D6, 2C19 polymorphism were determined by PCR-RFLP method. Results : None of the Sasang types showed significant difference in CYP2D6, 2C19 polymorphism. However, the Tae-um type showed relatively low frequency of CYP2D6 $^{*}$10/$^{*}$10 polymorphisms with low activity (p=0.110). In the So-yang type, specific $^{*}$3/$^{*}$3 genotype which is a poor metabolizer of CYP2C19$^{*}$3 was detected (p=0.078).Conclusion . These results suggest that the Tae-um type which is said to have high liver function in SCM has the tendency of high drug-metabolizing enzyme activity. With further study, the CYP polymorphism could serve as a scientific tool for SCM diagnosis.

• Journal of Acupuncture Research
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• v.17 no.3
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• pp.10-24
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• 2000

1. Objectives : Millions of people throuout the world are affected by some form of dry eye disorder. I made researches for more effective treatments for dry eye. 2. Methodes : I refered to occidental and oriental medical records. 3. The results were as follows : Common symptoms of dry eye are dryness, burning, irritation, grittiness, itching, fatigue of eye, photophobia, congestion, mattering and tear. Treatments of dry eye are to clear away heat and fire, remove dampness, replenish Um and promote production of body fluid, tonify the blood and replenish Ki. Acupunctre and moxibustion therapy of dry eye are as follows: Very busy points of traditional regular acupuncture are Sangsong, Chanjuk, Sajukkong, Chongmyong, Sabaek, Tongjaryo, Taeyang, Pungji, Tuimup, Paekoe, Un-gyo, Chonjong, Hapkok, Yangbaek, Kansu, Yanggye, Imup, Chok-samni, Taechung, Kwangmyong, Yang-gok, Uihui, Chohae, Haenggan. Less busy points of it are Oyo, Kuhu, Sungup, Konmyong, Konmyongl, Konmyong2, Sangmyong, SanghaChongmyong, Shinmyong, Osang, Shinjong, Yonghyang, Yaemyong, Chon-yu, Chon-ju, Kwallye, Naebi, Noeho, Tuyu, Mokchang, Ponshin, Shinhoe, Yepung, Okchim, Pungbu, Kokchon, Kollyun, Nae-gwan, Tae-nung, Samumgyo, Sokolkong, Shinsu, Um-gyo, Igan, Chongok, Choktaek, Kyonjungsu, Kokchi, Kongchoe, Kyuum, Kihae, Taekolkong, Taedon, Pino, Pisu, Sabong, Samgan, Kokchi, Shinmun, Shinmaek, Shimsu, Yangno, Aengmun, Yolgyol, Oegwan, Wijung, Chang-gan, Chungjo, Chungdo, Chigu, Chium, Chollyo, Tongni, Pungmun, Haryom. Very busy points of ear-acupuncture are Kan, Bi, Shin, An, Less busy points of it are Shim, Pye, Naebunbe, Mok1, Mok2, Shinmun, Ichom. Useful points of bleeding by needle are Taeyang meridian, Yangmyong meridian, Chono, Chonjong, Paekoe, Sangsong, Chanjuk, Sajukkong, nasal cavity. Useful points of moxibustion are Inchung, Huaryo, Shinchu, Pungmun, Kansu, Shimsu, Kokchi, Kongchoe, Sohae.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.39 no.8
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• pp.46-51
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• 2002

A new interleaved synchronous mirror delay(SMD) is proposed in order to reduce the circuit size and the power. The conventional interleaved SMD has multiple pairs of forward delay array(FDA) and backward delay away(BDA) in order to reduce the jitter. The proposed interleaved SMD. requires one FDA and one BDA by changing the position of multiplexer. Moreover, the proposed interleaved SMD solves the polarity problem with just one extra inverter. Simulation results show that about 30% power reduction and 40% area reduction are achieved in the proposed interleaved SMD. All circuit simulations and implementations are based on a 0.25um two-metal CMOS technology.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.278-281
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• 2014

This paper presents the performance comparison of three types of full-wave rectifiers for vibration energy harvesting. The first rectifier is consisted of two active diodes and two MOSFETs, and the comparators of the active diodes are powered from the output of the rectifier. The second one is a 2-stage full-wave rectifier. It comprises the basic rectifier consisted of four MOSFETs and an active diode. The comparator is also powered from the output of the rectifier. The third one is an input powered rectifier. It has the same structure as the second rectifier, but the comparator is powered from the input of the rectifier. These rectifiers have been designed using a 0.35um CMOS process and their performances have been compared through simulations. In terms of efficiency, the first rectifier shows the best performance at heavy loads, but the second one is suitable at light loads. When the power consumption during absence of vibration is more important than efficiency, the input-powered rectifier is proper.